CN102009270A - Surface protection sheet for laser material processing - Google Patents

Abstract

The object of the present invention is to provide a surface protection sheet for laser processing, which is applied to the opposite side surface of the laser beam irradiation surface, the protection sheet can protect the surface of the applied object during laser cutting processing, and prevent dross from appearing. According to the present invention, there is provided a surface protection sheet 1 for laser processing, which is applied on the opposite side surface of the laser beam irradiated surface 2a of the workpiece 2 in the cutting process of irradiating the workpiece 2 with the laser beam 6, which comprises A base layer and an adhesive layer formed on one surface of the base layer, wherein the base layer is made of a resin material having a melt viscosity of not more than 200 Pa.s measured at 290° C. based on JIS K7199 (1999), and has a thickness of 0.01 -0.12mm.

Description

Surface protection sheet for laser material processing

This application is a divisional application of a Chinese patent application with an application date of June 27, 2006 and an application number of 200680023392.7.

field of invention

The present invention relates to a surface protection sheet for laser processing, which is applied to a workpiece subjected to cutting processing by laser beam irradiation.

Background technique

During transportation, processing, cladding, etc., it is customary to apply sheets of resin material to protect the surface of components such as metal plates, coated metal plates, aluminum window sashes, resin plates, decorative copper plates, vinyl chloride laminated steel plates, glass plates, etc. operate.

The required properties of the surface protection sheet include no peeling and delamination of the protective layer after application to the object of application, and no residual adhesive layer on the object of application after peeling and removal. In addition, it includes no detachment and delamination, damage, adhesive residue, etc. of the surface protective sheet on the application object after processing the processed object having the surface protective sheet applied thereto. For example, JP-A-2000-328022 and JP-A-2002-302657 disclose surface protective sheets for metal plates.

Among processing methods for plate elements and the like, laser cutting processing has outstanding advantages. This advantage is that, unlike stamping work, various dies are not required but only the design data of the work needs to be input. When the processing object (hereinafter, also referred to as a workpiece) is a metal plate in particular, it takes a shorter time than stamping work, and even Suitable for thicker workpieces and does not require lubricants. Therefore, the laser cutting processing market is gradually expanding. However, the laser cutting process requires high pressure (about 0.5-1.5Mpa) assist gas supply.

In some cases, for reasons of appearance or the like, it is desirable to perform laser cutting on a workpiece having a surface protection sheet applied thereto. In this case, due to the influence of the assist gas, there arises a problem that the surface protection sheet is undesirably detached from the workpiece. In order to solve such problems, JP-A-2-295688, JP-A-7-241688 and JP-A-2001-212690 propose laser cutting processing methods capable of suppressing delamination during laser cutting processing. These processing methods can suppress delamination of the protective sheet.

Contents of the invention

However, all the methods disclosed in the above-mentioned prior art documents have the problem of delamination of the surface protection sheet on the surface of the workpiece under the irradiation of the laser beam. The reason for this is considered to be that the assist gas only affects the surface irradiated with the laser beam. However, application of the surface protection sheet to the opposite side of the workpiece surface to which the laser beam is irradiated has not yet been practiced. The inventors of the present invention have conducted laser cutting processing in which the surface protection sheet in the above prior art document is applied to the opposite side of the workpiece surface to which the laser beam is irradiated, but found that a new problem arises when the surface is not used These problems were not found at all when the protective sheet was subjected to the laser cutting process. That is, burrs (dross) appeared around the cut portion. Fig. 2 is an explanatory diagram of dross. FIG. 2(A) is a plan view in which a columnar via hole 300 is formed by a laser cutting process. In the laser cutting process performed by the inventors of the present invention, a laser beam is irradiated on the opposite side surface 200a to the surface of the workpiece 200 to which the surface protection sheet 100 is applied. FIG. 2(B) is a sectional view along I-I of FIG. 2(A), in which dross 210 of a height t appears on the opposite side surface of the laser beam irradiated surface 200a. Once such dross 210 is present, an additional step of removing the dross is not preferred. In addition, since the surface in contact with the surface protection sheet 100 is mainly an angular table in the laser cutting process of the workpiece 200, without the surface protection sheet 100, the workpiece itself may be damaged when placed thereon.

The object of the present invention is to provide a surface protection sheet for laser processing, which is applied on the opposite side surface of the laser beam irradiation surface, thereby being able to protect the surface of the processed object, which is the most basic function of the protection sheet, and does not need to be used during the laser cutting process. It is easy to produce dross.

The inventors of the present invention have found that the surface protection sheet applied to the side surface opposite to the laser beam irradiated surface prevents the melt of the workpiece from being easily blown off by the assist gas during the laser cutting process, which promotes the formation of dross . Based on this, they have found a surface protection sheet for laser processing that is not prone to this problem, and the present invention is characterized by the following:

(1) A surface protection sheet for laser processing, which is applied to the surface on the opposite side of the laser beam irradiated surface of the workpiece in a cutting process in which the workpiece is irradiated with a laser beam, which includes a base layer and a base layer formed on the base layer. An adhesive layer on one surface of the base layer, wherein the base layer is made of a resin material having a melt viscosity of not more than 200 Pa.s measured at 290° C. based on JIS K7199 (1999), and has a thickness of 0.01 to 0.12 mm.

(2) The surface protection sheet according to (1), wherein the resin material includes a polyester-based resin.

(3) The surface protection sheet according to (2), wherein the polyester-based resin is a poly(ethylene terephthalate) resin.

(4) The surface protection sheet according to (1), wherein the resin material includes a polyolefin-based resin.

(5) The surface protection sheet according to any one of (1) to (4), wherein the workpiece is a metal plate.

(6) The surface protection sheet according to (5), wherein the metal plate is a stainless steel plate.

(7) The surface protection sheet according to (5), wherein the metal plate is an aluminum plate.

Using the surface protection sheet for laser processing in the present invention, dross is less likely to occur during laser cutting processing. Therefore, it is possible to perform laser cutting processing on workpieces, especially metal plates, etc., with damage protection on the side surfaces opposite to the laser irradiation surface. In one embodiment of the present invention, by installing a surface protection sheet on the surface irradiated by the laser beam (side 200a in FIG. Laser cutting of workpieces with protective sheets on both surfaces, which was not possible traditionally, becomes possible.

Description of drawings

Fig. 1 schematically shows the use of the surface protection sheet for laser processing of the present invention. FIG. 2 is an explanatory diagram of dross that occurs during laser cutting.

The symbols in the figure are as follows:

1 surface protection sheet for laser processing; 2 workpiece; 3 processing head; 31 converging lens; 4 cutting nozzle; 41 gas inlet; 5 gas supply device; 51 introduction tube; 6 laser beam; 7 auxiliary gas; 100 surface protection sheet; 200 workpieces; 210 dross; 300 through holes

BEST MODE FOR CARRYING OUT THE INVENTION

The surface protection sheet for laser processing of the present invention comprises a base layer and an adhesive layer. The base layer is made of a resin material having a specific melt viscosity, and has a thickness within a specific range. An adhesive layer may be formed on one surface of the base layer.

The melt viscosity of the resin material constituting the base layer is measured based on JIS K7199 (1999). More specifically, a measurement sample was obtained in accordance with the method described below, and the melt viscosity was obtained at 290° C. using a capillary die by testing the pressure and volume flow rate measurement methods. The specific method of obtaining test samples is as follows:

· When the resin material constituting the base layer is transparent, the resin material is palletized to obtain a test sample.

• When the adhesive layer and the base layer can be separated, remove the adhesive layer using an organic solvent, etc., and fine-cut only the base layer to obtain a test sample.

• When the adhesive layer and the base layer are not easily separated, the entire surface protection sheet is finely cut to obtain a test sample, and the melt viscosity obtained by measuring the test sample is taken as the melt viscosity of the resin material constituting the base layer.

• When the base layer has a multi-layer structure, fine-cut the entire base layer to obtain a test sample.

In the present invention, a resin material having a melt viscosity of not more than 200 Pa·s, preferably not more than 150 Pa·s, more preferably 20 to 100 Pa·s as measured by the above-mentioned test method is used as the base layer material. When the melt viscosity exceeds 200 Pa·s, the base layer in the laser cut part is not easily blown away, and as a result, dross is easily generated. When the melt viscosity is within the above preferred range, the dross is more easily blown away by the assist gas, so that the film formation becomes easier.

Resin materials having a melt viscosity of not more than 200 Pa·s measured at 290°C typically include polyester-based resins. Among them, mention may be made of poly(ethylene terephthalate), poly(butylene terephthalate), poly(ethylene naphthalate), poly(trimethylene terephthalate), Poly(lactic acid), polycarbonate, etc. In addition, amide-based polymers such as nylon-6, nylon-66, nylon-12, etc.; styrene-based polymers such as HIPS, GPPS, etc.; acrylic-based polymers such as poly(methyl methacrylate) can be mentioned. etc.; polyolefin-based resins, such as propylene-based polymers, vinyl polymers, vinyl-copolymerized polymers, etc. As the propylene-based polymer, there may be mentioned homopolymer series, block polymer series, random polymer series, and the like. As the vinyl polymer, there may be mentioned low density, high density, linear low density polymers and the like. As the vinyl copolymer, there may be mentioned copolymers of ethylene and polar polymers such as vinyl acetate, methyl methacrylate, acrylic acid, and the like, and the like. A single one of these polymers or an arbitrary mixture of two or more of them can be used as the resin material. The above-mentioned melt viscosities of these resins are not necessarily within the aforementioned ranges, and the resins used in the present invention can be easily obtained from these resins measured by the methods defined by JIS. In addition, the base layer may be made to have a multi-layer structure and the like.

The base layer may contain appropriate additives such as fillers (such as calcium carbonate, talc, calcium oxide, etc.), anti-blocking agents, lubricants, titanium dioxide, organic and Inorganic pigments, antioxidants for anti-degradation, etc., UV absorbers, light stabilizers, antistatic agents, etc. In addition, a plasticizer or the like for improving the elasticity of the base layer may also be added. In addition, surface treatment such as corona treatment can be carried out on the surface of the base layer to improve its adhesion with post-treatment agents, adhesives and primers. In order to avoid dross generation and ensure the function as a protective sheet, the lower limit of the thickness of the base layer is 0.01mm, preferably 0.02mm. The upper limit is 0.12 mm, preferably 0.10 mm, more preferably 0.05 mm.

Adhesive layer is explained below

An adhesive layer is formed on one surface of the base layer. The adhesive layer only needs to have adhesion to the stainless steel plate, which is a typical workpiece. As the adhesive of the adhesive layer material, known rubber-based adhesives, acrylic-based adhesives, polyester-based adhesives, and polyurethane-based adhesives can be used. Among these adhesives, rubber-based adhesives and acrylic-based adhesives are preferable from the viewpoints of adhesion to metal plates, mold release, and cost. Adhesive layers of these adhesives are preferably used because of their adhesion to metal plates and glass plates in addition to stainless steel plates.

As the rubber-based adhesive, for example, natural rubber-based adhesives, synthetic rubber-based adhesives, and the like can be mentioned. As synthetic rubber-based adhesives, styrene-based elastomers such as polybutadiene, polyisoprene, butyl rubber, polyisobutylene, styrene-butadiene-styrene block are used as main components Copolymers, etc., styrene-based elastomers, such as styrene-ethylene-butylene-styrene block copolymers, styrene-ethylene-butylene random copolymers, etc., ethylene-propylene rubber, propylene-butylene rubber, Ethylene-propylene-butene rubber, etc.

As the acrylic-based adhesive, for example, a copolymer of a monomer mixture of an alkyl (meth)acrylate such as butyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, etc. as a main component is used, If necessary, other monomers such as hydroxyl group-containing monomers (for example, 2-hydroxyethyl (meth)acrylate, etc.), carboxyl group-containing monomers, etc., are used as copolymerizable monomers for modification. monomers (such as (meth)acrylic acid, etc.), styrene-based monomers (such as styrene, etc.), vinyl esters (such as vinyl acetate, etc.), and similar monomers. The acrylic-based adhesive can be obtained by a conventional polymerization method such as a solution polymerization method, an emulsion polymerization method, a UV polymerization method, and the like.

If necessary, in order to control the adhesiveness of these adhesives and the like, for example, crosslinking agents, tackifiers, softeners, olefin-based resins, silicone-based polymers, liquid acrylic-based copolymers, phosphate ester series compounds, Anti-aging agents, light stabilizers such as hindered amine series light stabilizers, etc., UV absorbers and other suitable additives such as fillers, pigments, etc., such as calcium oxide, magnesium oxide, calcium carbonate, silicon dioxide, zinc oxide and titanium dioxide .

The addition of the tackifier effectively improves the adhesion, relative to every 100 parts by weight of the above adhesive, the amount of the tackifier added is preferably 0-50 parts by weight, especially 0-30 parts by weight, particularly preferably 0-10 parts by weight In order to improve the adhesive performance and avoid the problem of adhesive residue due to the reduction of cohesion and other reasons. Herein, 0 parts by weight means that no tackifier is added.

As the tackifier, for example, one or more known suitable adhesives such as petroleum-based resins (e.g. aliphatic series, aromatic series, aliphatic-aromatic copolymer series, alicyclic series, etc.) can be used , coumarone-indenyl resins, terpene-based resins, terpene-phenol-based resins, polymerized rosin-based resins, (alkyl)phenol-based resins, xylyl resins and their hydrogenated series resins, etc.

The addition of softeners is usually effective in improving adhesive properties. As the softener, for example, one or more of low-molecular-weight diene-based polymers, polyisobutylene, hydrogenated polyisoprene, hydrogenated polybutadiene, and derivatives thereof can be used, and the addition amount thereof can be appropriately determined. In particular, per 100 parts by weight of the above adhesive, it is 0-40 parts by weight, especially 0-20 parts by weight, especially 0-10 parts by weight. As used herein, 0 parts by weight means that no softener is added. When the added amount is not more than 40 parts by weight, there will be little adhesive residue even under high temperature or exposure to outdoor environment.

The thickness of the adhesive layer can be appropriately determined according to adhesive performance and the like. Usually, the thickness is set at 0.001-0.050mm, especially 0.002-0.020mm, especially 0.003-0.015mm. When necessary, the adhesive layer is also protected until actual use by temporarily installing a partition or the like.

The surface protection sheet for laser processing can be produced according to a known adhesive sheet forming method including, for example, a solution obtained by dissolving an adhesive composition in a solvent or applying a liquid melt obtained by heating the composition. A method to a base layer, comprising forming an adhesive layer on a separator and transferring and adhering the adhesive layer to the base layer, comprising extruding and forming an adhesive layer for forming the adhesive layer on the base layer The method of coating the base layer, the method including co-extruding the base layer and the adhesive layer in two or more layers, the method including monolayer lamination of the adhesive layer on the base layer or laminating A method of laminating two layers of an adhesive layer and an adhesive layer on a base layer, a method including laminating two or more layers of an adhesive layer and a base layer or a laminate layer, etc., and the like.

The surface protection sheet for laser processing of the present invention may have a release layer. As a post-treatment agent for forming a release layer, a post-treatment agent made of a solvent-type or non-solvent type silicone-based polymer or a long-chain alkyl polymer is generally used. Specifically, Peeloil (manufactured by Ipposha Yushi Kogyo Co., Ltd.), Shin-Etsu silicone resin (manufactured by Shin-Etsu Chemical Co., Ltd.), or the like can be used. As a method of forming the release layer, for example, a known coating method such as a method of coating using a roll coater (eg, a gravure method, etc.), an atomization method by spraying or the like, and the like can be used.

The description of the application of the surface protection sheet for laser processing of the present invention is given below.

Fig. 1 shows the application of the surface protection sheet for laser processing of the present invention. A surface protection sheet 1 for laser processing of the present invention is adhered to a workpiece 2 subjected to a cutting process by irradiation of a laser beam 6 . In the equipment shown in this figure, the laser beam 6 is focused by the converging lens 31 of the processing head 3, and then irradiates the workpiece 2 from the cutting nozzle 4. However, the laser beam generator of the present invention is not limited to the one shown in the drawing. The auxiliary gas 7 is sprayed from the cutting nozzle 4 to the workpiece 2 together with the laser beam 6 at a high pressure of about 0.5-1.5 MPa. The assist gas 7 is supplied from the gas supply device 5 such as a gas column through the introduction pipe 51 and the gas introduction port 41 . As for the auxiliary gas 7, different gases can be appropriately used according to the material of the workpiece 2 and the quality of the surface to be cut off. Typically, nitrogen, air, etc. are used.

The workpiece 2 is a cutting target, and is, for example, a metal plate, a coated metal plate, an aluminum window sash, a resin plate, a decorative copper plate, a vinyl chloride-laminated steel plate, a glass plate, or the like. The effect of the invention is particularly prominent in the case of metal plates that are prone to slag and require good appearance, especially stainless steel plates and aluminum plates.

The cutting process by irradiation of the laser beam 6 includes irradiating the laser beam 6 from one side of the workpiece 2 to form a cutting section penetrating to the opposite side of the irradiated surface, thereby breaking at least a part of the workpiece. As shown in Figure 2, it can be the machining of removing the columnar part, or the machining of dividing a large workpiece into multiple small pieces. In cutting processing, the surface protection sheet 1 for laser processing of the present invention is to be adhered to the surface on the opposite side of the laser beam irradiation surface 2a of the workpiece 2 (processing object). In other words, the cutting process is performed by irradiating the laser beam 6 to the surface 2a on the opposite side to the application surface of the workpiece 2 with the surface protection sheet 1 for laser processing of the present invention applied to the workpiece 2 . The surface protective sheet 1 for laser processing of the present invention is applied to the surface on the opposite side of the laser beam irradiation surface 2a of the workpiece 2, at least to the portion cut by the cutting process. In the workpiece 2, the surface on which the laser processing surface protection sheet of the present invention is applied can avoid damage caused by fixing laser processing equipment, etc., and in addition, it is not easy to cause dross.

Example

Hereinafter, the present invention is explained in more detail by referring to examples, which should not be construed as limiting the invention.

(Example 1)

An isocyanate series crosslinking agent (3 parts by weight, CORONATE L, produced by NIPPONPOLYURETHANE INDUSTRY CO., LTD.) was added to acetic acid containing an acrylic-based adhesive (100 parts by weight, with a weight-average molecular weight of 600,000 based on polystyrene). In ethyl ester solution, obtain acrylic base adhesive solution, this acrylic base adhesive contains 2-ethylhexyl acrylate (2EHA, 30wt%), ethyl acrylate (EA, 60%), methyl methacrylate ( MMA, 6 wt%) and 2-hydroxyethyl acrylate (HEA, 4 wt%).

A poly(ethylene terephthalate) film (Tetoron Film G2, manufactured by Teijin DuPont Films Japan Limited) having a thickness of 0.038 mm was directly used as the base layer. The melt viscosity at 290° C. of the resin material sampled in the base layer was 74 Pa·s.

The acrylic-based adhesive solution was applied to the aforementioned base layer and dried to form an adhesive layer with a thickness of 0.010 mm, whereby a surface protection sheet for laser processing was obtained.

(Example 2)

Poly(butylene terephthalate) (DURANEX 200FP, manufactured by WinTech Polymer Ltd.) was formed into a film by a T-die method at a die temperature of 250° C. to obtain a 0.04 mm thick base layer. The melt viscosity at 290° C. of the resin material sampled from the base layer was 26 Pa·s.

The acrylic-based adhesive solution used in Example 1 was applied to the base layer, and dried to form an adhesive layer with a thickness of 0.005 mm, whereby a surface protection sheet for laser processing was obtained.

(Example 3)

Except that a 0.05 mm thick poly(ethylene terephthalate) film (Tetoron Film G2, manufactured by Teijin DuPont Films Japan Limited) was used as the base layer, in the same manner as in Example 1, a surface protection sheet for laser processing was obtained .

(Example 4)

Low-density polyethylene (MIRASON 68P, Mitsui Chemicals, Inc.) was used as the base layer material, and styrene-ethylene-butylene-styrene block copolymer (Tuftec H1062, manufactured by AsahiKasei Corporation, 100 parts by weight) and hydrogenated A mixture of petroleum resin (ARKONP-100, manufactured by Arakawa Chemical Industries, Ltd., 50 parts by weight) was used as the adhesive layer material. These materials were co-extruded by a T-die method at a die temperature of 170° C. to obtain a surface protection sheet for laser processing, and an adhesive layer with a thickness of 0.01 mm was formed on a base layer with a thickness of 0.05 mm. The melt viscosity at 290° C. of the resin material sampled from the base layer was 47 pa·s.

(Example 5)

A surface protection sheet for laser processing was obtained in the same manner as in Example 1 except that the thickness of the adhesive layer was set to 5 μm.

(comparative example 1)

Low-density polyethylene (SUMIKATHENE F208, manufactured by Sumitomo Chemical Co., Ltd.) was formed into a film by a film blowing method at a mold temperature of 160°C to obtain a base layer of 0.11 mm thick. The melt viscosity at 290° C. of the resin material sampled from the base layer was 285 Pa·s.

One surface of the base layer was subjected to corona discharge treatment, and the acrylic-based adhesive solution used in Example 1 was applied to the treated surface, and dried to form a 0.010 mm thick adhesive layer, whereby , to obtain a surface protection sheet for laser processing.

(comparative example 2)

A surface protection sheet for laser processing was obtained in the same manner as in Comparative Example 1 except that the thickness of the base layer was set to 0.06 mm.

(comparative example 3)

A surface protection sheet for laser processing was obtained in the same manner as in Example 1, except that a 0.125 mm thick poly(ethylene terephthalate) film (Tetoron Film G2, manufactured by Teijin DuPont Films Japan Limited) was used as the base layer . As in Example 1, the melt viscosity at 290° C. of the resin material sampled from the base layer was 74 Pa·s.

(comparative example 4)

Polypropylene (Novatech PPFL6H, manufactured by Japan Polypropylene Corporation) was formed into a film by a T-die method at a mold temperature of 230°C to obtain a base layer of 0.04 mm thick. The melt viscosity at 290° C. of the resin material sampled from the base layer was 422 Pa·s.

One surface of the base layer was subjected to corona discharge treatment, and the acrylic-based adhesive solution used in Example 1 was applied to the treated surface, and dried to form an adhesive layer with a thickness of 0.010 mm, whereby, Surface protection sheet for laser processing.

(comparative example 5)

Poly(butylene terephthalate) (DURANEX 800FP, manufactured by WinTech Polymer Ltd.) was formed into a film through a T-die at a die temperature of 270° C. to obtain a base layer of 0.04 mm thick. The melt viscosity at 290° C. of the resin material sampled from the base layer was 295 Pa·s.

The acrylic-based adhesive solution in Example 1 was applied to one surface of the base layer, and dried to form an adhesive layer with a thickness of 0.005 mm, whereby a surface protection sheet for laser processing was obtained.

(melt viscosity measurement)

Melt viscosity was measured by the aforementioned method. Specifically, a capillary rheometer (Capirograph 1B, manufactured by Toyo Seiki Seisaku-sho, Ltd.) described in JIS K7199 was used, and the cutting nozzle diameter D was 1.0 mm, and the land length L was 30 mm. The measurement was performed at a cutting rate of 10 sec ^-1 .

(Laser cutting processing conditions)

Using a carbon dioxide gas laser processing machine (LC-3015θII, manufactured by AMADA CO., LTD.) and an oscillator (OLC-420HII, manufactured by AMADA CO., LTD.), and at a cutting rate of 2200mm/min, an output power of 3000W, and a frequency of 0Hz , duty factor (duty) 100, nitrogen pressure 0.85MPa, cutting nozzle diameter 2.0mm, cutting nozzle gap 0.3mm, laser beam focused on the upper surface of the workpiece (metal plate) at 1.0mm below the wire cutting process.

(laser cutting processing test)

Use 2.0mm thick SUS304 (2B finish) as the workpiece. The surface protective sheet for laser processing obtained in each example or comparative example was applied to one surface thereon. Under the aforementioned conditions, a cutting process test was performed by irradiating a laser beam on the side surface opposite to the surface to which the aforementioned sheet was applied.

After the test, the height of dross occurring on the surface to which the aforementioned sheet was applied was determined. The difference obtained by subtracting the thickness of the metal plate (2.0 mm) from the height of the cutting edge surface is taken as the height of dross. As a measuring instrument, an indicating gauge described in JIS B7503 (1997) with a minimum scale of 0.01 mm is used. Ten points were measured at intervals of 10 mm to obtain an average value. The results are listed in Table 1.

In addition, the surface protection sheet for laser processing obtained in Example 5 was applied to one surface of the workpiece, and SPV-M-4002E (manufactured by NITTO DENKO CORPORATION) was applied to the other surface of the workpiece, and the obtained sample was used as Example 6. In Example 6, under the aforementioned conditions, a cutting process test was performed by irradiating a laser beam to the surface to which M-4002E was applied.

Laser cutting was performed on a workpiece without a surface protection sheet as Comparative Example 6.

Table 1

As shown in Table 1, it illustrates that the surface protection sheet for laser processing of each embodiment can reduce the height of dross to the same level as that of the embodiment without the application of the surface protection sheet.

This application is based on Patent Application No. 2005-187216 filed in Japan, the entire contents of which are incorporated herein by reference.

Claims (4)

1. method that is used for preventing on the surface of Laser cutting and the laser-beam irradiated face opposite side of metallic plate, producing dross, it comprises:

Metallic plate with surface protective plate is provided; described surface protective plate sticks on the surface of opposite side of laser-beam irradiated face of metallic plate; described surface protective plate comprises basalis and the adhesive phase that forms on one of this basalis surface; wherein said basalis is by being that 20 to 100Pas polyester-based resin or polyolefin resin are made based on JIS K7199 (1999) at the melt viscosity of 290 ℃ of measurements; and its have 0.02～0.05mm thickness and

Carry out cutting processing by the irradiation of the laser beam on the metallic plate, wherein cut with described metallic plate at surface protective plate described in the described cutting processing.

2. method according to claim 1, wherein said polyester-based resin is poly-(ethylene glycol terephthalate) resin.

3. method according to claim 1 and 2, wherein said metallic plate are corrosion resistant plate.

4. method according to claim 1 and 2, wherein said metallic plate are aluminium sheet.

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